EP 2579464 B1 20210407 - Input-independent self-calibration method and apparatus for successive approximation analog-to-digital converter with charge-redistribution digital to analog converter
Title (en)
Input-independent self-calibration method and apparatus for successive approximation analog-to-digital converter with charge-redistribution digital to analog converter
Title (de)
Eingabeunabhängiges Selbstkalibrierungsverfahren und Vorrichtung für einen Analog-Digital-Wandler mit schrittweiser Annäherung mit einem Digital-Analog-Wandler mit Lastumverteilung
Title (fr)
Appareil et procédé d'auto-étalonnage indépendent de l'entrée pour convertisseur analogique/numérique par approximations successives avec convertisseur numérique/analogique à redistribution de charge
Publication
Application
Priority
US 201113269495 A 20111007
Abstract (en)
[origin: EP2579464A2] A method and apparatus for correcting the offset and linearity error of a data acquisition system. A charge redistribution digital to analog convertor (CDAC) is connected to one of the differential inputs of a comparator whose second input comes from a function CDAC. The calibration algorithm is built into a digital control unit. The digital control unit detects the offset and capacitor mismatch errors sequentially, stores the calibration codes for each error in calibration mode and provides the input-dependent error correction signals synchronized with the binary search timing to adjust the differential input of the comparator and compensate the input-dependent errors present at the output of the non-ideal function CDAC during normal conversions.
IPC 8 full level
CPC (source: EP US)
H03M 1/1047 (2013.01 - EP US); H03M 1/1052 (2013.01 - EP US); H03M 1/462 (2013.01 - EP US); H03M 1/468 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2579464 A2 20130410; EP 2579464 A3 20161116; EP 2579464 B1 20210407; CN 103036564 A 20130410; CN 103036564 B 20160420; US 2013088375 A1 20130411; US 8638248 B2 20140128
DOCDB simple family (application)
EP 12185619 A 20120924; CN 201210365828 A 20120927; US 201113269495 A 20111007